EP 0495600 A1 19920722 - Polling method in a radio data packet communication system.
Title (en)
Polling method in a radio data packet communication system.
Title (de)
Abfrageverfahren in einem drahtlosen Paketdatenübermittlungssystem.
Title (fr)
Méthode de scrutin dans un système de communication de paquets de données par radio.
Publication
Application
Priority
JP 1487091 A 19910114
Abstract (en)
A central station (101) continuously transmits a slot of predetermined time length which comprises a polling frame Pxx and a downward data frame Ixx. After receiving the upward data frame Dxx, it sequentially and repeatedly carries out an individual polling of upwardly communicating terminal stations (102,103) at a time interval which is more than the predetermined time interval for the polling frame Pxx. Unspecified polling is carried out of unspecified terminal stations by a polling frame Po which does not carry out this individual polling. Independently of the polling frame Pxx, the downward data frame Ixx is repeatedly transmitted to downwardly communicating terminal stations (104,105). The polling frame Pxx and the downward data frame Ixx which are included within the same slot are transmitted to a terminal station (106) which is in the upward and downward duplex communication mode at a time interval longer than the predetermined time interval. The terminal stations (102-106) transmit a polling request Rxx or an upward data frame Dxx to the polling frame Pxx from the central station (101) at a time interval longer than the predetermined time interval. <IMAGE>
IPC 1-7
IPC 8 full level
H04B 7/24 (2006.01); H04L 12/403 (2006.01)
CPC (source: EP)
H04L 12/403 (2013.01)
Citation (search report)
- [X] US 4466001 A 19840814 - MOORE MORRIS A [US], et al
- [A] US 4742512 A 19880503 - AKASHI FUMIO [JP], et al
Designated contracting state (EPC)
DE GB SE
DOCDB simple family (publication)
EP 0495600 A1 19920722; EP 0495600 B1 19960410; AU 1019392 A 19920716; AU 641302 B2 19930916; CA 2059239 A1 19920715; CA 2059239 C 19981013; DE 69209669 D1 19960515; DE 69209669 T2 19961128; JP 2882062 B2 19990412; JP H04241533 A 19920828
DOCDB simple family (application)
EP 92300254 A 19920110; AU 1019392 A 19920113; CA 2059239 A 19920113; DE 69209669 T 19920110; JP 1487091 A 19910114